condition mean min max 4 h after light 19.1791 17.4757 20.8825 8 h after light 13.4149 13.4125 13.4173 12 h after light 15.78425 14.7353 16.8332 4 h after dark 16.401833333333336 14.8515 17.6839 8 h after dark 20.2495 18.1829 21.3253 12 h after dark 18.2675 17.4204 19.2154